How to increase the power of a 3.0 gasoline engine?

The power isn't great.

How many meters is a supercharger?

I recently added a VT turbo to my 3.0, and it feels much better. In city driving with stop-and-go traffic, the fuel consumption increased by 1-2 liters compared to before. But it's perfect for long-distance travel, where it actually saves 1-2 liters compared to before.

ECU remapping or adding a supercharger.